BRPI0615235A2 - Method and protocol for handling access attempts to communication systems - Google Patents

Abstract

METHOD AND PROTOCOL FOR HANDLING ACCESS ATTEMPTS FOR COMMUNICATION SYSTEMS. An improved access attempt procedure for establishing a call is achieved by deriving an access transmission probability as a function of both a priority level for access attempts and a cause of random access, and performing connection establishment and call establishment authentication. derivation-based safety control system.

Description

"METHOD AND PROTOCOL FOR HANDLING ACCESS ATTEMPTS FOR COMMUNICATION SYSTEMS"

Field of the Invention

The present invention relates to radio communications, and in particular relates to the management of access attempts for communication systems.

Background of the Invention

A radio (wireless) communication system may be comprised of an access network and a plurality of access terminals. The access network may include access points, such as Bs Nodes, base stations, or the like, which allow access terminals to connect with access network for upper-link communications (UL: terminal to network) and for link communications. (DL: network to terminal) via various channel types. Access terminals may be user equipment (UE), mobile stations, or the like.

Although the concepts written here may apply to different types of communication systems, the Universal Mobile Telecommunications System (UMTS) will be described merely for exemplary purposes. A UMTS typically has at least one central network (CN) connected with at least one UTRAN (UMTS Terrestrial Radio Access Network) that has BS Node acting as access points for multiple UEs.

Figure 1 shows the radio interface protocol architecture according to 3GPP radio access network standards. The radio interface protocol has horizontal layers comprising a physical layer, a data link layer, and a network layer, and has vertical planes comprising a user plane (U plane) for transmitting user data and a control plane (plan C) to transmit control information. The user plan is a region that handles traffic information with the user, such as Internet protocol (IP) or voice packets. The control plane is a region that handles control information for a network interface, call maintenance and management, and the like.

The protocol layers in Figure 1 can be divided into a first layer (L1), a second layer (L2), and a third layer (L3) based on the lower three layers of a standard system interconnect model (OSI). The first layer (LI), called the physical layer (PHY), provides an information transfer service to an upper layer using various radio transmission techniques. The physical layer is connected to a top layer called the Media Access Control (MAC) layer via a transport channel. The MAC layer and the physical layer are exchanged via the transport channel. The second layer (L2) includes a MAC layer, a radio linkage control (RLC) layer, a transmission / multiple transmission control (BMC) layer, and a data convergence protocol packet layer ( PDCP). The ma-25 MAC layer overrides mapping between logical channels and transport channels and provides MAC parameter distribution to allocate and redistribute radio resources. The MAC layer is connected to a higher layer called the radio link control (RLC) layer via a logical channel. Several logical channels are provided according to the type of information transmitted.

The MAC layer is connected to the physical layer via transport channels and can be divided into a MAC-b sublayer, a MAC-d sublayer, a MAC-c / sh sublayer, a MAC-hs sublayer, and a MAC-m sublayer. , depending on the type of transport channel being managed. The MAC-b sublayer manages a Transmission Channel (BCH), which is a transport channel that handles system information transmission. The MAC-c / sh sublayer manages a common transport channel, such as a Direction Access Channel (FACH) or a Bottom Link Shared Channel (DSCH), which is shared by a plurality of terminals, or in upper link, the Random Access Channel (RACH). The MAC-m sublayer can handle MBMS data. The MAC-d sublayer manages a dedicated channel (DCH), which is a dedicated transport channel for a specific terminal. The MAC-d sublayer is located on a service RNC (SRNC) that manages a corresponding terminal, and a MAC-d sublayer also exists on each terminal.

The RLC layer, depending on the RLC mode of operation, supports reliable data transmissions and performs segmentation and concatenation on a plurality of RLC service data units (SDUs) delivered from a top layer. When the RLC layer receives the RLC SDUs from the upper layer, the RLC layer adjusts the size of each RLC SDU appropriately based on processing capacity, and then creates data units by adding header information to it. These data units, called protocol data units (PDUs), are transferred to the MAC layer via a logical channel. The RLC layer includes an RLC temporary storage for storing RLC SDUs and / or RLC asPDUs.

The BMC layer programs a cell transmission (CB) message transferred from the central network and transmits the CB message to terminals positioned in one or more specific cells.

The PDCP layer is located above the RLC layer. The PDCP layer is used to effectively transmit network protocol data, such as IPv4 or IPv6, over a relatively small bandwidth radio interface. For this purpose, the PDCP layer unnecessarily reduces control information used in a wired network, that is, a function called header compression is performed.

The radio resource control (RRC) layer located at the bottom of the third layer (L3) is only defined in the control plane. The RRC layer controls transport channels and physical channels with respect to configuration, reconfiguration, and release or cancellation of radio transmitters (RBs). RB means a service provided by the second layer (L2) for data transmission between the terminal and the UTRAN. In general, RB configuration refers to the process of stipulating the characteristics of a protocol layer and a channel required to provide a specific data service, and configuring the respective detailed parameters and methods of operation. Additionally, the RRC bed handles user mobility within the RAN, additional services, for example, location services.

Call establishment between a UE (User Equipment) and a wireless network in current wireless communication systems, such as UMTS, is performed on a RACH (Random Access Channel) according to appropriate procedures. The time interval within which the UE may initiate a random access procedure is derived based on a Random Service Class (ASC) that gives a level of superiority for access attempts. The random access procedure is divided into two phases: an access attempt phase, and when access is successful, the message transmission phase indicating a cause of establishment. When the cause of establishment is decoded by the network, depending on the request and availability of radio resources, a decision is made by the network to accept or reject the call establishment.

In general, the procedure where the UE sends a first message to the network is referred to as an initial access. For this, the common upper link channel called RACH (Random Access Channel) is used. In all cases (GSM and UMTS systems), random access starts from the UE with the connection request message including the reason for the request, and the network response that indicates the distribution of radio resources for the reason. requested.

There are several reasons, which may be referred to as a cause of establishment, for sending a connection request message and the following list shows some e-examples specified in UMTS:

Source Talk Call, Broadcast Continuous Call, Interactive Source Call,

Called Origin Base,

Source Subscribed Traffic Call, Talk Terminal Call, Broadcast Call Continuous Terminal, Interactive Call Terminal,

Terminal Base Call, Emergency Call, Inter-RATReselect Registration, RemovalHigh Priority Source Signaling

Low Priority Origin SignalingCall Reinstatement, Terminal High Priority Signaling, Terminal Low Priority Signaling. With respect to the definitions of the terms used above

For example, source calling devices that the UE wants to set up a connection (for example, a voice connection), terminal calling devices that the UE answers to the page, while registration devices that the user wants to register only to perform an update of location.

To send the information through the air interface, the physical random access procedure is used. The transmission of physical random access is performed under the control of a higher layer protocol, which performs some important functions related to priority and control overload. These procedures differ between GSM and UMTS radio systems. The description of the GSM random access procedure can be found in "GSM System for Mobile Communications", published by M. Mouly and Μ. B. Pautet, 1992. As the present innovation relates to UMTS improvement / evolution, the W-CDMA random access procedure will be described in more detail below.

In the UMTS physical layer random access procedure, the UE randomly selects an access resource and transmits a RACH preamble portion of a random network access procedure. The preamble is a short signal that is sent before the RACH connection request message is transmitted. The UE repeatedly transmits the preamble by increasing the transmit power each time the preamble is sent until it receives an AI (Acquisition Indicator) on an AICH (Acquisition Indicator Channel), which indicates preamble detection by the network. The UE stops preamble transmission once it receives the AI (Acquisition Indicator), and sends part of the message at a power level equal to the preamble's transmit power at that point, plus a signaled offset by the network. This random access procedure avoids a power boost procedure for the entire message. Such a power-up procedure would create more interference due to unsuccessfully sent messages and would be less efficient due to the longer delay, since it would take much longer to decode the message before acknowledgment could be given that it was successfully received.

The main features of RACH is that it is a containment-based channel, which means that due to the simultaneous access of multiple users, collision may occur that the initial access message may not be decoded by the network. The UE may initiate random access transmission (both preambles and message) only at the beginning of an access period. This type of access method is then a type of channeled ALOHA approach with rapid acquisition indication.

Figure 2 shows an example of a time slot (i.e. access periods) related to a random access transmission, while Figure 3 shows examples of receiving a lower link AICH access period by the UE and receiving a period of time. upper en-lace PRACH access by EU.

The time axis of both RACH and AICH is divided into time intervals, called access periods. There are 15 access periods per two frames (one frame is 10 ms long or 38400 chips) and they are spaced at 1. , 33 ms (5120 chips) each. Information on which access periods are available for random access transmission and which time offsets to use between RACH and AICH, between two successive preambles and between the last preamble and the message signaled by the network. If the time interval of the AICH transmission is equal to 0 and 1, it is sent 3 and 4 access periods after the last transmitted access period preamble, respectively.

As for the preamble format, each preamble consists of 4096 chips, which is a sequence of 256 Hadamard code repeats in length 16. Ha-damard codes are related as the preamble signature. There are 16 different signatures and one signature is selected randomly (from available ASC-based subscription sets) and repeated 256 times for transmission of the preamble part.

Figure 4 shows an exemplary AICH structure (format). The AICH consists of a sequence repetition 15 consecutive access periods, each having a 40-bit slot length (5120 chips). Each access period consists of two parts, an Acquisition Indicator (AI) part consisting of 32 real value signals, ... a31 and a 1024 chip duration part where the transmission is turned off.

When the network detects the transmission of a RACH preamble in a given RACH access period, it repeats that subscription in the associated AICH access period. This means that the Hadamard code, used as the RACH preamble signature, is modulated in the AIdo AICH part. The acquisition indicator corresponding to the signature may obtain values +1, -1, and 0, depending on whether a positive acknowledgment, a negative acknowledgment or a non-acknowledgment is given to a specific signature.

A positive signature polarity indicates which preamble has been acquired and the message can be sent. A negative polarity indicates that the preamble has been acquired and the power lift procedure should be stopped, but the message should not be sent. This negative acknowledgment is used when there is a congestion situation on the network, so a transmitted message cannot be processed in the present tense. In this case, the attempted access needs to be repeated some time later by the UE.

For the control of random access transmissions, the network decides whether the mobile station should be allowed to use the radio access feature based primarily on the access class to which the UE belongs. A specified priority level is derived from the Access Class (AC) that is stored on the UE SIM card.

A certain aspect of access control will be described here. With regard to the purpose of access control, under certain circumstances it will be desirable to prevent EU users from making access attempts (including emergency call attempts) or responding to pages in specific areas of a Public Land Mobile Network (PLMN). These situations may appear during emergencies, or where 1 of 2 or more co-located PLMNs have failed.

Broadcast messages should be available in a cell-by-cell basis indicating the class (es) of subscribers barred from the access network. Using this feature allows the network operator to prevent overloading the access channel under critical conditions. The access control is not intended to be used under normal operating conditions. Figure 5 shows an example of the types of access class (AC) and their respectively related access service (AS), each containing an element. of information (IE).

For distribution, all UEs are members of one of ten randomly distributed mobile populations, defined as Access Classes 0 to 9. The population number can be stored in a SIM / USIM for the UE. Additionally, the UEs may be members of one or more of 5 special categories (Access Classes 11 to 15), which may also be stored in SIM / USIM. These can be distributed to specific high priority users as follows. (This enumeration is not intended as a priority sequence): Class 15 - PLMN15 Working Group Class 14 - Emergency Services

Class 13 - Utilities (eg water / gas supply);

Class 12 - Security Services Class 11 - For PLMN.20 Use For operation if the UE is a member of at least

an Access Class that corresponds to the allowed classes as signaled by an air interface, and the Access Class is applicable on the service network, access attempts are allowed. Otherwise, access attempts 25 are not allowed.

Access Classes are applicable as follows: Classes 0 - 9 - Residential and Visited PLMNs, Classes 11 and 15 - Residential PLMN only, Classes 12, 13, 14 - Residential PLMN and Parent-Only PLMNs.

Any number of these classes can be barred at any time.

For emergency calls, a control bit known as Access Class 10 is also signaled by the air interface to the UE. This indicates that whether or not the Emergency Call access network is allowed for UEs with access classes 0 through 9 or without an IMSI. For UEs with access classes 11 through 15, Emergency Calls are not allowed. if both Access Class 10e and relevant Access Class (11-15) are barred. Otherwise, Emergency Calls may be allowed.

In UMTS, CAs are mapped to Access Service Classes (ASC). There are eight different priority levels defined (ASC 0 to ASC 7), with level 0 being the highest priority.

For mapping Access Classes to Access Service Classes, Access Classes should only be applied at initial access, ie when sending an RRC CONNECTION REQUEST message. A mapping between Access Class (AC) and Access Service Class (ASC) shall be indicated by the AC-to-ASC mapping of the information element in the System Information Block type5. The correspondence between AC and ASC is shown in Figure 5.

In the table in Figure 5, no. IE indicates an ASC number in the range 0 - 7 for AC. If the ASC indicated by IE is not defined, the behavior of the UE is not specified. For random access, the parameters arising from the respective ASC shall be used. In the case that EU is a member of multiple CAs, he must select the ASC for the highest AC number. In connected mode, AC should not be applied.

An ASC consists of a subset of RACH preamble signatures and access periods, which are allowed to be used for this access attempt and a persistence value corresponding to a probability Pv <1 to attempt a transmission. Another mechanism for controlling random access transmission is a load control mechanism, which allows you to reduce the incoming traffic load when the likelihood of collision is high or when radio resources are low.

Figures β and 7 show a flowchart of the control access procedure.

1. Existing specifications provide many RACH transmission control parameters that are stored and updated by the UE based on system information transmitted over the network. RACH transmission control parameters include Physical RACH (PRACH), Access Service Class (ASC), a maximum number of indentation preamble lift cycles range Mmax from the time marker Tboi, given in terms of numbers N80Imax and NBoiminr 10 ms transmission time intervals apply when negative acknowledgment on AICH is received (S201).

2. The UE maps the CA assigned to an ASC, and a count value M is set to 0 (S203, S205, S207) .3. The count value M is increased by one (S209). Next, the UE determines whether the count value M represents the number of transmission attempts that exceeds the maximum number of allowed RACH transmission attempts Mmax (S211). If so, then the UE considers the transmission to be split (S212).

4. However, if M is less than or equal to the maximum number of Mraax allowed RACH transmission attempts, then the UE updates the RACH transmission control parameters (S213). In the next step, a 10 ms T2 time stamp is set (S215). The UE decides whether to attempt transmission based on the persistence value Pi associated with the UE-selected ASC. Specifically, a random number Ri is generated between Oel (S217). If the random number Ri is less than or equal to the persistence value Pi, the UE attempts to transmit by the assigned RACH resources, otherwise the UE waits until the 10 ms T2 time marker expires and executes the procedure in step 4 again (S219, S220 , S221).

5. When an access attempt is transmitted, the EU determines whether the network responds with an Ack (ACK), a Non Ack (NACK), or no response (S223). No response is received from the network, after the time stamp T2 has expired, the process is performed again from step 3 (S224). If a NACK, indicating that a network transmission failure (often due to collision) reception is received, then the UE waits for the time stamp T2 to expire, and then generates a randomly-picked Nboise indentation value between the maximum and minimum indentation values. , NBOimax and NBoimin, associated with the PRACH assigned to the UE (S225). The UE then expects a Tboi indentation of 10 ms times the NBOi indentation value before executing the process from step again (S226). If aACK, which indicates reception of the UE transmission by the network, is received, then the UE initiates the message transmission (S227).

Figure 8 shows an example of Signaling Establishment procedure. Once the PRACH power control preambles have been recognized, the RRC Connection Request message can be transmitted (S81). It contains the reason why the connection is requested.

Depending on the reason for the request, the radio network makes a decision as to the type of resources to be re-served, and performs synchronization and de-signaling between certain radio network nodes (ie, Be RNC Service Node) (S82 ). When the wireless network is ready, it sends the Connection Setup message to the UE leading information about which radio resources to use (S83). The UE confirms the connection establishment by sending the Complete Connection Configuration (S84) message. When the connection has been established, the UE sends an Initial Direct Transfer message including a large amount of information, such as the UE identity, its current location, and the requested transaction type (S85). Then the UE and the network authenticate each other and establish communication security mode (S86). Actual setup information is delivered via the Call Control Setup (S87) message. It identifies the transaction and indicates the quality of service requirements (QoS). Upon receipt of the message, the network initiates radio transmitter distribution activities by checking that sufficient resources are available to satisfy the requested QoS. If so, the radio transmitter is distributed according to the request. If not, the network may select or continue distribution with a lower QoS value, or it may select to queue the request until the radio resources that become available or reject the call request (S88, S89).

Summary of the Invention

Technical problem

However, the present inventor recognized that perfections to the foundation of the technique could be made. That is, a problem that needs to be resolved is the delay associated with the random access procedure and the level of interference due to network signaling with call establishment.

For example, since the access attempt has been recognized by the network, the data message, which contains the reason for the connection request, can be transmitted. If the EU is within an area of poor upper link coverage, then it is possible that the network will not receive this message and not send a reply. In this case, the UE may need to re-transmit this message many times and it may have a significant impact on call back delay and also affect the level of network interference.

A scheme for managing access attempts for communication systems is achieved by deriving a probability of access transmission as a function of both a priority level for access attempts and the purpose (s) for RACH (i.e. , Random Access Cause, RACH Cause, Random Access Reason, etc.).

Brief Description of the Drawings

Figure 1 shows the radio interface protocol architecture according to 3GPP radio access network standards.

Figure 2 shows an example of time interval (i.e. access periods) related to a random access transmission.

Figure 3 shows examples of reception of a lower link AICH access period by the UE and reception of an upper link PRACH access period by the UE.

Figure 4 shows an exemplary structure of an AICH.

Figure 5 shows an example of the types of access classes (CA) and their respective related access service class (ASC) having an information element (IE).

Figures 6 and 7 show an exemplified flowchart of the control access procedure.

Figure 8 shows an example of a Signaling Establishment procedure.

Figure 9 shows a procedure for calling the foundation of the technique.

Figure 10 shows an exemplary call setup procedure of the present invention.

Detailed Description of the Invention

One aspect of the present invention is recognition by the present inventor of the related technique problems and disadvantages described above. Based on such recognition, the features of the present invention have been developed.

While the following description will refer to UMTS-optimized RACH procedures merely for the sake of explanation, the features of the present invention are clearly intended to be applicable to various other types of communication methods and systems that would benefit from the use of particular features of the invention. present invention.

One aspect of the invention is to provide priority levels for allowed access attempts based on the access class (CA) and the purpose (s) for RACH.

It should be noted here that the purpose (s) for RACH may be referred to by other similar terms and phrases, such as the cause of random access, cause of RACH, cause of establishment, reason for random access. , similar. However, it can be clearly understood that such a label and other terminology are merely examples and thus can be clarified (or corrected) as a result of ongoing or future discussions on standardization.

Another aspect of the invention is to derive the RACH purpose (s) from the first access attempt step through the various combinations of frequency domain access resource allocation in the dotempo domain in the of code, or mixtures of these. The allowable access attempt distribution resources can be achieved in a number of ways, with the most appropriate depending on the application or purpose (s) for RACH and the type of data being transferred or particular requirement.

The invention could be implemented as part of any wireless or fixed network in order to optimize the random access delay and to reduce the interference level of the associated signals.

Similar to the foundation of the technique, all UEs are members of randomly distributed mobile populations, defined as Access Classes (CA). The population number can be stored in the UE (for example, stored in a SIM / USIM). If the UE is a member of at least one AC matching the allowed classes as. signaled by the network, access attempts are allowed; otherwise, access attempts are not allowed.

Equation (1):

Allowed access attempt = f (access service class).

In the present invention, UE derives when initiating access attempts based on the probability of transmission based on the class of access service and also based on access resources distributed for the corresponding purpose (s). for RACH as signaled by the network. Equation (2):

Access transmission probability = f (access service class, RACH proposals). The particular RACH purpose (s) to which a UE wishes access determines when the UE is allowed to use access resources. The distribution of access resources should be done through various combinations of radio resources in the frequency domain, time domain, code domain, or naming thereof.

Equation (3):

Radio access resource distribution = f (time and / or frequency and / or code and / or ...).

Equation (4):

Allowed Access Feature = f (ARCH purposes).

Access resources should be broken down for RACH purposes with different priorities. It is noted that the purposes for RACH could be divided into different purposes for RACH groups depending on the type of data to be transferred, such as traffic class (conversation, ground, interactivity, continuous transmission); mobility management (updating of the location area, etc); measurement report, and the like.

Each purpose for RACH represents the priority of access attempt transmission, such that certain cause types are more likely to acquire access than other cause types. The distribution of access resources could be fixed or based on a load balancing through the possible cause of establishment. Load balancing can be implemented in different ways, for example:

Random Distribution

In a random distribution, access resources are randomly assigned to any purpose for RACH. Such a case may lead to overloading access resources for one RACH purpose while under distribution from others, as one purpose for RACH may be allocated much more access resources over a period of time, while the other purpose for RACH is without resources. assigned access points. However, on average, each RACH purpose gets its share of the load due to random selection.

Uniform Distribution

Uniform distribution keeps access resources equally divided between the RACH purposes available in an orderly manner. Access resources are distributed on a rotating basis. The resource distribution for the first purpose for RACH is randomly selected from the RACH purpose list. For the following distributions, the selection follows the circular order. Since the purpose for RACH is assigned to access resources, this purpose for RACH is moved to the end of the list.

Weighted Distribution

Weighted distribution is a variant of uniform distribution. In the case of a weighted distribution, one can assign a weight to each RACH purpose in the list that if a network / operator wants to distribute twice as many access resources to one RACH purpose as the other, this purpose for RACH gets a two weight. In such cases, the network / operator can take care of the re-ability and access capability for any RACH purpose.

The setting of a load balancing should be decided on the particular requirement. For example, weighted distribution should be used:

- if any of the purposes for RACH were higher than the others to process;

- to allow access for some purposes to RACH while denying access to the other; and / or

- to control the availability of radio resources dedicated to specific services.

However, if capacity is equally required for all RACH purposes, uniform distribution will suffice.

Accordingly, the access resources on which the UE attempts to access indicate, for the purpose (s) of ARRACH. In such a case, the present invention solves the problems of the basic technique.

Without the need to transmit or relay message driving purpose for RACH, thus: the number of signaling messages is reduced; and the level of interference caused by retransmissions is decreased.

Also, the likelihood of collision is decreased by: 1 / number of RACH purposes, as the RACH purposes to which a UE desires access determines when the UE is allowed to use access resources.

Thus, the total access delay is decreased compared to the base technique.

Figure 9 shows a call setup procedure of the base technique, and Figure 10 shows one embodiment of a call setup procedure of the present invention.

Referring to Figure 9, the call establishment procedure in the related art has requested the exchange of several messages between a mobile terminal (UE: user equipment) and a radio network. The call setup procedure is divided into two phases.

In the first phase, the UE derives a probability of random access based on an access service class (S91). By doing so, a message indicating an attempted access procedure is sent to the network (S92). When the access attempt is successful, the network responds by sending a message indicating such a procedure to the UE (S94). It may be noted that multiple access attempts need to be performed repeatedly until success. In these multiple access attempts, a new probability of random access is derived for each repetition (S93).

In the second phase, upon receipt of the message from the network indicating that the attempted access was successful, the UE then transmits another message including purpose (s) to RACH (ie the reason or purpose of the establishment). (S95). Upon appropriate reception, the network sends an acknowledgment back to the UE (S97). Here, sending the purpose (s) to RACH may need to be repeated until proper acknowledgment of the network is received (S96).

Upon completion of the first and second phase, a connection establishment authentication and call control security are performed (S98).

Referring to Figure 10, the call setup procedure of the present invention requests a minimum amount of message exchanges between the UE and the network. Here, the second stage procedure of the related technique is not necessary in the present invention.

The UE derives a probability of random access based on an access service class and also on the RACH (SlOl) purposes. By doing so, a message indicating an attempted access procedure is sent to network (S102). When the access attempt is successful, the network responds by sending a message indicating this procedure to the UE (S104). It may be noted that multiple access attempts may need to be repeated until success. In these multiple access attempts, a new probability of random access is derived for each repetition (S103).

Subsequently, a call establishment authentication and security control for the call establishment are performed (S104, S105).

So far, an exemplary scheme for enhanced access attempts has been described for mobile communication systems. However, the concept and features of the present invention are not limited to the wireless system, but are applicable in any communication system that has an access protocol for communication resources.

The probability of access transmission is based on both the class of access service as well as the purposes for RACH (ie random access cause, ARCH cause, etc.). The reason for call establishment is derived from the first phase of attempted access through various access resource distribution combinations. The particular purpose for RACH for which a UE wants access determines when the UE is allowed to use access resources.

The present invention may result in a decrease in random access delays, a decrease in the likelihood of collision, a decrease in signaling messages, a decrease in the interference level caused by a message transmission of establishment cause. related, and the like.

Minimizing call setup delay through the network can also be achieved by improving coverage and reducing the number of retransmissions.

The present invention provides a method of manipulating access attempts over a network. The method comprises: allocating access resources depending on at least one cause of random access relative to access service classes; transmit information about distributed access resources; and allow at least one terminal to perform access attempts using distributed access resources.

The method may further comprise: deriving the cause of random access from a preamble in an access burst received from the terminal. The derivation step may include: using radio resources divided between various random access causes or random access cause groups with different priorities. The distribution step may comprise the distribution of access resources in a fixed and dynamic manner. The dynamic distribution of access resources can be based on load balancing. Load balancing can be performed through random access causes. Load balancing may be implemented by at least one group comprising random distribution, uniform distribution and weighted distribution. The network may know how to reserve the appropriate resources for a traffic channel depending on the cause of random access. The cause of random access may be derived from the first phase of an access attempt through various combinations of frequency domain, time domain, or both access resource allocation. Access resource allocation may also depend on the type of data to be transferred.

Also, the present invention provides a method of manipulating access attempts by a terminal, the method comprising: receiving parameters about access attempts from a network; receive information about radio access resources at each cause of random access; and trying random access based on an access service class is a cause of random access.

The retry step can be performed in a window period if time division multiplexing is used. The attempt stage may comprise: transmitting a preamble in an access burst related to the cause of random access. The access service class can be used to derive a random access attempt, and the cause of random access is used to derive which access resources will be used.

Additionally, the present invention provides a radio interface protocol stack comprising: a protocol entity adapted to derive an access transmission probability as a function of both a priority level for access attempts and a cause of random access. , and perform authentication of the connection establishment and the derivation-based security control call establishment.

The priority level can be defined as an access service class indicating a randomly distributed mobile population number. The cause of random access can be defined as a purpose for RACH. The protocol stack where features can be implemented on a mobile terminal. The bypass step may comprise: receiving parameters about access attempts from a network; and receive information about radio access resources for each cause of random access. The protocol entity can be implemented in a network entity. The derivation step may comprise: distributing access resources depending on at least one cause of random access in relation to the access service classes; and transmitting to a mobile terminal information on distributed access resources.

It should be noted that the features of the present invention are related at least to the 3GPP standard. Certain relative parts of the 3GPP specification, such as 22,001 (= GSM 02.11), 25,321, 25,331, related to the Control Protocol specification. Media Access (MAC), V6.5.0 and its related sections or parts thereof, as well as further development enhancements thereof, belong to the present invention. Such standards are part of the embodiments of the present invention and form part of the present disclosure incorporated herein by reference.

This specification describes various embodiments of the present invention. The scope of the claims is intended to cover various modifications and equivalent arrangements of the illustrative embodiments described in the specification. Therefore, the following claims should be accorded with the reasonably broader interpretation to cover modifications, equivalent structures, and features that are consistent with the spirit and scope of the invention described herein.

Claims (21)

A method of manipulating access attempts by a network, characterized by the fact that it comprises: distributing access resources depending on at least one cause of random access to access service classes, transmitting information about distributed access resources; Allow at least one terminal to perform access attempts using distributed access features. A method according to claim 1, further comprising: deriving the cause of random access from a preamble in an access burst received from the terminal. Method according to claim 2, characterized in that the derivation step comprises: using radio resources divided between various random access causes or groups of random access causes with different priorities. Method according to claim 1, characterized by the fact that the distribution step comprises the distribution of access resources in a fixed or dynamic manner. Method according to claim 4, characterized in that the dynamic distribution of access resources is based on load balancing. Method according to claim 5, characterized in that the load balancing is performed through random access causes. A method according to claim 5, characterized in that the load balancing is implemented by at least one of a random distribution, uniform distribution and weighted distribution. Method according to claim 1, characterized in that the network knows how to reserve appropriate resources for a traffic channel depending on the random access cause. A method according to claim 1, characterized in that the cause of random access is derived from a first phase of an attempt to access through various frequency domain access distribution combinations in the frequency domain. time, or both. Method according to claim 9, characterized in that the access resource distribution also depends on the type of data to be transferred. 11. A method of manipulating access attempts by a terminal, characterized in that it comprises: receiving parameters on access attempts from a network, receiving information about radio access resources for each cause of random access; attempt random access based on an access service class and a random access cause. A method according to claim 11, characterized in that the trial step is performed within a given window period if time-scattered multiplexing is used. A method according to claim 11, characterized in that the attempt step comprises: transmitting a preamble in an accessory burst related to the cause of random access. A method according to claim 11, characterized in that the class of access service is used to derive a random access attempt, and random access accusation is used to derive which access resources will be used. 15. Radio interface protocol stack, characterized in that it comprises: a protocol entity adapted to derive a probability of access transmission as a function of both a priority level for access attempts and a cause of random access, and for perform link establishment authentication and branch-based security control call establishment. 16. Protocol stack according to claim 15, characterized in that the priority level is defined as an access service class indicating a randomly distributed mobile population number. see original document page </formula> Protocol stack according to claim 15, characterized in that the cause of random access is defined as a purpose for RACH. Protocol stack according to claim 15, characterized in that the features are implemented in a mobile terminal. Protocol stack according to claim 18, characterized in that the bypass step comprises: receiving parameters on access attempts from a network; receive information about radio access resources for each cause of random access. Protocol stack according to claim 15, characterized in that the protocol entity is implemented in a network entity. Protocol stack according to claim 20, characterized in that the bypass step comprises: allocating access resources depending on at least one cause of random access to the access service classes; and transmit to a mobile terminal information about distributed access resources.